Pile-driving tool



Dec. 2, 1930'. 1 l.. RlcHARD'soN 1,783,523

- PILE DRIVING TOOL l Filed Oct. 26, 1928 INVENTOR E0 Z. RICHARDSIY ATT NEYS I Patented Dec. 2, 1930 UNITED Asrarrs PATENTV o LED L. RICHARDSON, OF CLEVELAND, OHIO, .ASSG-NOR T THE COMPANY FFIVCE CLEVELAND ROCK DRILL PILE-DRIVING TOOL Applicationy led October 26, 1928. Serial No. 315,215.

This invention rela-tes to improvements in tools for driving pilings of planks and similar sheathing and embraces that type of tool which is adaptable for use with fluid actuated machines such as rock drills of the hammer type.

In pile driving devices customarily in use, it has been found that the high vibratory motion of the hammer frequently causes crystallization or metal fatigue in the ,portion of the apparatus intermediate the shank of the tool and the anvil. This crystallization and the consequent failure of the tool occurs more frequently when the strains imposed upon the shaft of the anvil support are divergent to the medial aXis of the work, as is the case when the tool is used to drive a pile which has shifted or has become tilted.

One of the objects of the invention, therefore, is to construct a pile driving tool which is capable of resisting the deleterious effects of the vibrations to which it is subjected and to provide a structure which isinsusceptible to fracture when used in angulated relation g with the work.

ture, and which is organized to accommodate the ready renewal of fractured or worn elements.

Other objects more lor less ancillary to' the foregoing and the manner in which all of the various objects are realized will ap-,

pear in the following description which considered 1n connection wlth the accompanying drawings, sets forth the preferred embodi-` ment of the invention.

In the drawings Figure 1 is a perspective view partially in section of a rock drill including one embodiment of the improved pile driving attachment;

Figure 2 is an elevational view partially in section illustrating the construction of the pile driving attachment;

Figure 3 islongitudinal sectional view of the attachment, the section being taken on a plane indicated by line 3-3 in Figure 2;

Figure 4 is a detail elevational view of one of the elements' of the pile driving tool; and

Figure 5 is a detail sectional view of the anvil for the attachment. Referring to the construction illustrated inl Figure 1 thel rock drill comprises a cylinder in which there is reciprocatively. mounted a piston 117 co-ordinated in the usual manner Ywith a tappet, which impels with percussive force, the coaXially aligned pile driving tool 13. The motive fluid which actutes the piston is controlled by the customary throttle 12.

The tool or pile driving attachment enibodies an arm 14 upon which there is pivotally mounted a driving block or anvil 15. The arm is constructed with a shank 16, adapted for cooperative engagement with. the tool chuck 1'?, and a swaged head portion 185 formed with a `convexedly arcuate face 19, and a centrally disposed aperture 20. The

'anvil 15 embraces a pair of vertically disposedj ears 21 whichare apertured to receive a bolt 22 provided to "facilitate theY pivotal support of the anvil upon Jthe arm 14:. The body of the anvil intermediate theears 2l is formed with a concavity 23 which is of complemental coniigiiration to the arcuate face ofthe head 1 18 and which, by virtue of the clearance proably proportioned, with respect to the thickness of the Work for which it is adapted, to aiiord an intimate telescopic enga-gement of the fui-cations Q3 with the end of the piling.

In the practice of this invention the anvil may be adjusted upon the end of a piling and the machine set in operation irrespective of any divergency between the axis of the Work and the medial axis of the machine. As the pile is being driven it maybe observed that the angular relation thereof is inconsistentwith the position of the other pilings in the retaining wall. In this event the operator may incline the hammer through an angle opposed to the tilted position of the Work and Without removing the anvil or stopping the machine effectuate the correct seated position ot the piling.

It will be noted that the aperture 20 being enlarged with respect to the body ot the bolt will permit the engagement of the arcuate tace of the head 18 with the concave bearing seat 523. Thus the pereussive torce-s transmitt'ed through the arm Will be born by the anvil and the counter forces initiated by tilting the hammer Wlll be repelled Within the Zone of engagement of the pile and anvil rat-her than through the axis ot' the arm as is the case in the homogeneous type of apparatus.

Although the foregoing description is necessarily ot a detailed character in order that the invention may be completely set forth, it is to be understood that the specific terminology is not intended to be restrictive or confining, and that various rearrangements of parts and modifications of structural detail may be resorted to Without departing from the scope or spirit of the invention as herein claimed.

I claim:

1. A pile driving tool comprising an arm and an anvil, an arcuate bearing face in said arm and a complemental bearing seat in said anvil and pivotal means co-ordinated with said arm and anvil to permit the engagement of the said bearing tace with the said bearing seat.

2. A pile driving tool comprising an arm having a convexedly arcuate bearing face formed in a. headed portion thereof, an anvil having a. bearing seat of complemental configuration with the bearing face in said arm, a pivot pin supported by said anvil and loosely supporting said arm.

8. A pile driving tool comprising an arm l'laving a conveXedly arcuate bearing face formed in a headed portion thereof, an anvil having a bearing seat of complemental configuration with the bearing face in said arm., a pair of vertically disposed ears on said anvil, a pivot pin retained in said ears, said pivot pin loosely supporting said arm.

t. A pile driving tool comprising an arm having a eonvexedly arcuate bearing face formed in a headed portion thereof, an anvil having a bearing seat of complemental configuration with the bearing face in said arm, a pair ot' vertically disposed ears on said anvil, a pivot pin retained in said ears, said pivot pin loosely supporting said arm and dependent urcations formed in the outer face of the anvil.

In testimony whereof I hereunto afiix my signature this 18th day of October, 1928.

LED L. RICHARDSON. 

